/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include <fstream>
#include <iostream>
#include <sstream>
#include <string>

#include "gtest/gtest.h"

#include "dbcommon/checksum/hw-crc32c.h"
#include "dbcommon/checksum/sw-crc32c.h"

#ifndef DATA_DIR
#define DATA_DIR ""
#endif

using namespace dbcommon;  // NOLINT

class ChecksumTest : public ::testing::Test {
 public:
  ChecksumTest() {}
  virtual ~ChecksumTest() {}

  void SetUp() {
    in.open(DATA_DIR "checksum1.in");
    ASSERT_TRUE(!!in);
    uint32_t value;
    std::string str;

    while (getline(in, str)) {
      std::stringstream ss(str);
      ss.imbue(std::locale::classic());
      ss >> value >> str;
      cases.push_back(std::make_pair(value, str));
    }
    in.close();

    in.open(DATA_DIR "checksum2.in");
    ASSERT_TRUE(!!in);
    in >> result;

    while (getline(in, str)) {
      strs.push_back(str);
      str.clear();
    }

    in.close();
  }

  void TearDown() { cases.clear(); }

 protected:
  std::ifstream in;
  uint32_t result = -1;
  std::vector<std::string> strs;
  std::vector<std::pair<uint32_t, std::string>> cases;
};

TEST_F(ChecksumTest, HWCrc32c) {
  HWCrc32c cs;

  if (cs.available()) {
    EXPECT_EQ(0u, cs.getValue());

    for (size_t i = 0; i < cases.size(); ++i) {
      size_t len = cases[i].second.length();
      const char* data = cases[i].second.c_str();
      std::vector<char> buffer(sizeof(uint64_t) + len);

      for (size_t j = 0; j < sizeof(uint64_t); ++j) {
        memcpy(&buffer[j], data, len);
        cs.reset();
        cs.update(&buffer[j], len);
        EXPECT_EQ(cases[i].first, cs.getValue());
      }
    }

    cs.reset();
    EXPECT_EQ(0u, cs.getValue());

    for (size_t i = 0; i < strs.size(); ++i) {
      cs.update(&strs[i][0], strs[i].length());
    }

    EXPECT_EQ(result, cs.getValue());
  } else {
    std::cout << "skip HWCrc32c checksum test on unsupported paltform."
              << std::endl;
  }
}

TEST_F(ChecksumTest, SWCrc32c) {
  SWCrc32c cs;
  EXPECT_EQ(0u, cs.getValue());

  for (size_t i = 0; i < cases.size(); ++i) {
    size_t len = cases[i].second.length();
    const char* data = cases[i].second.c_str();
    std::vector<char> buffer(sizeof(uint64_t) + len);

    for (size_t j = 0; j < sizeof(uint64_t); ++j) {
      memcpy(&buffer[j], data, len);
      cs.reset();
      cs.update(&buffer[j], len);
      EXPECT_EQ(cases[i].first, cs.getValue());
    }
  }

  cs.reset();
  EXPECT_EQ(0u, cs.getValue());

  for (size_t i = 0; i < strs.size(); ++i) {
    cs.update(&strs[i][0], strs[i].length());
  }

  EXPECT_EQ(result, cs.getValue());
}
